JavaScript防抖与节流详解

function debounce(fn, wait){
    var timer = null;
    return ()=>{
        if(timer !== null){
            clearTimeout(timer);
        }
        timer = setTimeout(fn, wait);
    }
}
function handle(){
    console.log(Math.random());
}
window.addEventListener("resize",debounce(handle, 1000));

function debounce(fn, wait){
	let timeid, flag = true;
	return () => {
		clearTimeout(timeid);
		if(flag){
			fn();
			flag = false;
		}else{
			timeid = setTimeout(()=>{
				flag = true;
			}, wait);
		}
	}
}

const debounce = (func, delay = 200) => {
  let timeout = null
  return function () {
    clearTimeout(timeout)
    timeout = setTimeout(() => {
      func.apply(this, arguments)
    }, delay)
  }
}

function throttle(fn,wait){
  let startTime = 0;
  return function(){
    let endTime = Date.now();
    if(endTime-startTime>wait){
      fn();
      startTime = endTime;
    }
  }
}

function throttle(fn,wait){
  let timeid = null;
  return function(){
    if(!timeid){
       timeid = setTimeout(function(){
         fn();
         timeid = null;
       },wait)
    }
  }
}